To change the password for the root user on an ESX 3.x or ESX 4.x host, you must reboot into single-user mode. To do this, follow these steps:

1.Reboot the ESX host.
2.When the GRUB screen appears, press the space bar to stop the server from automatically booting into VMware ESX.
3.Use the arrow keys to select Service Console only (troubleshooting mode).
4. Press the a key to modify the kernel arguments (boot options).
5. On the line presented, type a space followed by the word single. Press Enter. The server continues to boot into single-user mode.
6. When presented with a bash prompt such as sh-2.05b#, type the command passwd and press Enter.
7. Follow the prompts to set a new root user password. For more information, see Changing an ESX host root password (1004659).
8. When the password is changed successfully, reboot the host using the command reboot and allow VMware ESX to boot normally.

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